The basics Flashcards
yall are welcome to use this deck, just be aware that i just made this to remind myself of some things and it is NOT all inclusive!
what are 5 things that we can tell about the heart from an EKG?
- structure (hypertrophy/infarction)
- rate/rhythm
- electricity
- plumbing (what the heck)
- toxic effects that medications have on the heart
label this!
what is the amplitude, width and time span of one LARGE box
LARGE boxes have:
Width/height - 5mm
amplitude - .5mV
time - .2 seconds
what is the amplitude, width and time span of one SMALL box
SMALL boxes have:
width/height - 1mm
amplitude - .1mV
time - .04 seconds
what does the vertical axis represent on an EKG
amplitude (millivolts)
what does the horizontal axis of the EKG represent
duration (seconds)
Label:
P wave
PR segment
QRS segment
PR interval
ST segment
T wave
what are the three types of cells that make up the electrical systems of the heart?
myocardial
conductive
pacemaker cells
The waves on the EKG reflect the electrical activity of which type of cells?
pacemaker cells
The waves on the EKG are manifestations of what two processes?
depolarization and repolarization
what are the two ways that depolarization could occur
- Moving TOWARD an electrode – POSITIVE deflection
- Moving AWAY from an electrode – NEGATIVE deflection
what are the two ways that repolarization could occur
- Moving TOWARD an electrode – NEGATIVE deflection
- Moving AWAY from an electrode – POSITIVE deflection
what are the limb leads and what plane do they lie in
I, II, III, aVF, aVL, aVR
lie in frontal plane
what are the precordial leads and what plane do they lie in
V1, V2, V3, V4, V5, V6
lie in horizontal plane
what is the positioning of einthovens triangle for leads I, II, III?
what are the inferior leads of the heart
II, III, aVF
what are the lateral leads
I, aVL, V5, V6
what leads look at the right side of the heart
aVR, V1
what are the anterior leads of the heart
V2, V3, V4
what are the sepral leads
V2, V3
not all inclusive
